setup problem

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Please I am requesting your help!!!!! I am trying to install JRE 6.20, OS Windows 7 home edition, I get this message: The Wizard was interrupted before Java 6 update 20 could be installed. try later.
I uninstall everything about java, using REVO, but it is impossible to install it.

But if I run the setup for JRE 6 update 7, it installs ok. but nothing after update 7 can be installed.

I don't want to re-install my operation system, to fix this problem.

I am using Chrome Browser, but the problem is exact the same with IE8 or Firefox.

There are two different installers, one which downloads stuff during installation (< 1mb) and another one which contains everything required (~15mb).
I recommend you to try the latter, which you can download from http://java.sun.com